Riding mower



FIG. 1 is a right, front perspective view of a riding mower showing our new design;

FIG. 2 is a right rear perspective view thereof;

FIG. 3 is a left front perspective view thereof;

FIG. 4 is a right, front perspective view of a riding mower showing a second embodiment of our new design, the sole difference being in the configuration of the front grill and headlight panel; and

FIG. 5 is a left front perspective view of FIG. 4. 

The ornamental design for a riding mower, substantially as shown and described. 